LED illumination device having a heat sink with a plurality of sets of fins defining air tunnels of different sizes

Abstract

An LED illumination includes a heat sink, and an LED module mounted on the heat sink. The heat sink includes a base, a receiving tube extending upwardly from a first face of the base, and a plurality of fins arranged on the first face of the base and surrounding the receiving tube. The plurality of fins extends radially and outwardly beyond an outer periphery of the base in relation to the receiving tube. A band engages and encloses the plurality of fins. A plurality of air tunnels are defined between the base, the band and the plurality of fins. The LED module is mounted on a second face of the base opposite to the first face.

What is claimed is: 
     
       1. An LED illumination device comprising:
 a heat sink comprising a base, a receiving tube extending upwardly from a first face of the base, and a plurality of fins arranged on the first face of the base and surrounding the receiving tube; 
 an LED module mounted on a second face of the base opposite to the first face; and 
 a band which engages and encloses the plurality of fins; 
 wherein the plurality of fins extend radially and outwardly beyond an outer periphery of the base in relation to the receiving tube, and a plurality of air tunnels are defined between the base, the band and the plurality of fins; and 
 wherein the plurality of fins comprises sets of fins, and each set of fins comprises three spaced first fins and two spaced second fins with each second fin being interposed between every two adjacent first fins, wherein the air tunnels within each set of fins and the air tunnels between every two adjacent sets of fins are different in size. 
 
     
     
       2. The LED illumination device as described in  claim 1 , wherein the plurality of fins are spaced from each other, and an airflow passage is defined between every two adjacent fins. 
     
     
       3. The LED illumination device as described in  claim 2 , wherein each air tunnel is aligned with and directly communicated with a corresponding airflow passage. 
     
     
       4. The LED illumination device as described in  claim 3 , wherein the air tunnels are spaced from each other. 
     
     
       5. The LED illumination device as described in  claim 1 , wherein the plurality of the fins are different in length. 
     
     
       6. The LED illumination device as described in  claim 5 , wherein the plurality of the fins comprises a plurality of first fins having a relatively long length and a plurality of second fins having a relatively short length. 
     
     
       7. The LED illumination device as described in  claim 6 , wherein each first fin extends radially and outwardly from an outer circumference of the receiving tube, and each second fin extends radially and outwardly from a central region of the first face of the base apart from the receiving tube. 
     
     
       8. The LED illumination device as described in  claim 1 , wherein the size of each air tunnel within each set of fins is smaller than the size of each air tunnel between every two adjacent sets of fins. 
     
     
       9. The LED illumination device as described in  claim 1 , wherein the air tunnels each expand from the second face to the first face of the base. 
     
     
       10. The LED illumination device as described in  claim 1 , wherein the plurality of fins have substantially the same height. 
     
     
       11. The LED illumination device as described in  claim 1 , further comprising a light-guiding member engaged with the LED module, and the light-guiding member defines a plurality of tapered cavities for insertion of multiple LEDs included in the LED module. 
     
     
       12. The LED illumination device as described in  claim 1 , further comprising a lampshade engaging the heat sink. 
     
     
       13. The LED illumination device as described in  claim 1 , further comprising a cap hermetically connected to an upper end of the receiving tube, wherein the cap and the receiving tube cooperatively define a chamber. 
     
     
       14. The LED illumination device as described in  claim 1 , further comprising a driving module spaced apart from the heat sink by a predetermined distance. 
     
     
       15. The LED illumination device as described in  claim 14 , wherein the driving module comprises a power supply box and a power adapter accommodated in the power supply box, and the power supply box is connected to the heat sink via a connecting member. 
     
     
       16. The LED illumination device as described in  15 , wherein the base defines a through hole extending through the base from the first face to the second face, and electrical wires sequentially pass through the connecting member having a channel, the tube, and the through hole of the base to make an electrical connection between the LED module and the driving module. 
     
     
       17. The LED illumination device as described in  claim 1 , wherein the device further comprises a first sealant, and the base comprises an annular mounting portion along an outer periphery of the second face, and the annular mounting portion defines a first waterproof groove, and the first sealant is received in the first waterproof groove. 
     
     
       18. The LED illumination device as described in  claim 1 , wherein the device further comprises a wire arranger received in the receiving tube of the heat sink, and electrical wires extending between the LED module and the driving module are arranged by the wire arranger accommodated in the chamber. 
     
     
       19. The LED illumination device as described in  claim 1 , wherein the device further comprises a second sealant, and the upper end of the receiving tube defines a second waterproof groove for accommodating the second sealant. 
     
     
       20. An LED illumination device comprising:
 a heat sink comprising a base, a receiving tube extending upwardly from a first face of the base, and a plurality of fins arranged on the first face of the base and surrounding the receiving tube; 
 an LED module mounted on a second face of the base opposite to the first face; 
 a band which engages and encloses the plurality of fins; and 
 a driving module electrically connected to the LED module; 
 wherein the driving module is spaced apart from the heat sink by a predetermined distance to increase heat insulation between the driving module and the heat sink, and wherein the plurality of fins extends radially and outwardly beyond an outer periphery of the base in relation to the receiving tube, and a plurality of air tunnels are defined between the base, the band, and the plurality of fins; 
 and wherein the plurality of fins comprises sets of fins, and each set of fins comprises three spaced first fins and two spaced second fins with each second fin being interposed between every two adjacent first fins, wherein the air tunnels within each set of fins and the air tunnels between every two adjacent sets of fins are different in size.